Techumpseh 12.5hp Motor - Snowblower Forum : Snow Blower Forums
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post #1 of 6 Old 03-08-2019, 10:07 PM Thread Starter
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Techumpseh 12.5hp Motor

Hey All,

I have a Craftsman 33" wide 12.5 HP Tecumpseh snow blower. I posted a thread, because i've had some issues keeping auger belts on it, and it even broke the keyway on the pulley. Didn't get any responses.

I've replaced them and got it running again, I think.

The pulley and the V-Belt for the auger do seem to get very hot when in use though. After 10 minutes of snowblowing, the auger pulley is too hot to touch. This isn't normal, right? The pulley on the drive belt doesn't get nearly as hot.

The belt isn't overly tight, it's snug when the handle pulley engages, but the belt pops right off the pulley when it's released. But the head has to be coming from the friction of the V-belt and the 2 pulleys for the auger. IS this normal?
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post #2 of 6 Old 03-08-2019, 11:03 PM
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It sounds like your belt is oversized and/or is not being tensioned properly. Posting the Craftsman model number would help us at least tell you what the proper belt size is.
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post #3 of 6 Old 03-09-2019, 08:51 AM
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Video engaged and disengaged to show the looseness is best. What's snug to one person may not be the correct tightness. When engaged you do not want flapping, when disengaged you do not want slapping.

Find the correct length belt then measure your belt. You may have to drop down 1/4" or 1/2". The manual's correct size belt is not necessarily the size you will use, it's usually but not always.

Measure your belt using a flexible tape and binder clips to secure the tape measuring around the outside.

Make sure your belt stays are in place and adjusted correctly.

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post #4 of 6 Old 03-09-2019, 09:12 AM
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Belt is probably too loose. What kind of belt did you get? Some belts will stretch under load.
If the keyway broke in the pulley, I think I would start there. Something get caught in the auger or impeller to cause that? Impeller bearing seizing up?

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post #5 of 6 Old 03-09-2019, 09:29 AM
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Since the belt comes off by itself so easily, try this:

When the machine has cooled off, take the belt off the pulley that is hot, and take it right out of the machine.
Run the machine for 10 minutes.

Is the pulley hot now??.....probably not. If that's the case, at this point, you've proved that the heat is definitely generated by a slipping belt.

Is there any chance someone performed service on this machine and didn't have exactly the right belt, but found one that was "close enough" and slapped it on there?

Remember, getting the right friction between the belt and the pulley is not just a function of length and therefore tightness. It has to be the right shape to mate with the pulley and grip properly, as well as the right width. In other words: The right belt.
BTW: Did you smell the belt burning at all?

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post #6 of 6 Old 03-09-2019, 01:18 PM
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If it sheared the pulley key that tells me the problem is forward of the pulley. Yes with added torque needed to run the augers with a possible bad shaft bearing , or a dry auger gear box (no or low oil) binding impeller ( ice/ debris) will put added stress on the belt trying to turn the pulley and create heat that is normally not there with everything else in good working order.
Definitely thaw the machine out , eliminate ice as a problem , remove the belt and turn the pulley by hand and see how much force it takes to turn the shaft. You should be able to turn it pretty easily.
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